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Point Grey Grasshopper 3 GS3-U3-28S5M-C (USB3) or Grasshopper Express GX-FW-28S5M-C (Firewire-800) have large enough chips to just barely capture the whole solar disk without a reducer. Both are Mono, Sony ICX674 2/3", Global Shutter CCD, 1920 x 1440 at 26 FPS. I have the Firewire-800 version here, Firewire-800 being tried and true problem free technology, I chose it over USB3.
The current incarnation of the Lunt 100THa is D=102mm, F=7, FL=714mm. I have attached field of views for ICX205AL (DMK41), ICX274AL (DMK51) and ICX674.
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